Tufts University's Cummings School of Veterinary Medicine allows members of the public to walk their dogs in the school's Farm Field when it is not being used for agricultural purposes. The 40-acre parcel features a nearly 5-acre off-leash area for dogs who are current on their vaccinations and registered in their town of residence. Registration is required; free for Westborough (and Grafton) residents. For more information, please visit http://vet.tufts.edu/farm_field.